Re: [vpp-dev] stop handoff in SNAT
right and handoff is faster than locking Matus From: Yuliang Li [mailto:yuliang...@yale.edu] Sent: Friday, July 21, 2017 12:48 AM To: Matus Fabian -X (matfabia - PANTHEON TECHNOLOGIES at Cisco) Cc: vpp-dev@lists.fd.io Subject: Re: [vpp-dev] stop handoff in SNAT I think I get the reason. If the flow space split is dynamic, each thread has to propagate the state across all threads when new flows come, which requires locking. Using static flow space split can avoid this, at the cost of handoff for both directions. On Thu, Jul 20, 2017 at 9:44 AM, Yuliang Li mailto:yuliang...@yale.edu>> wrote: Thanks. That's a good point. But can I just use handoff on out2in? Because the in2out traffic is already split by RSS. On Wed, Jul 19, 2017 at 10:15 PM, Matus Fabian -X (matfabia - PANTHEON TECHNOLOGIES at Cisco) mailto:matfa...@cisco.com>> wrote: Hi, You need handoff when running multithread because traffic for specific inside network user must be processed always on same thread in both directions. Regards, Matus From: vpp-dev-boun...@lists.fd.io<mailto:vpp-dev-boun...@lists.fd.io> [mailto:vpp-dev-boun...@lists.fd.io<mailto:vpp-dev-boun...@lists.fd.io>] On Behalf Of Yuliang Li Sent: Thursday, July 20, 2017 5:58 AM To: vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io> Subject: [vpp-dev] stop handoff in SNAT Hi, Is there a way to stop handoff (move packet from one thread to another) in SNAT? I already use RSS to split packets across threads at the input, so I do not need it to spread traffic across threads again. Thanks, -- Yuliang Li PhD student Department of Computer Science Yale University -- Yuliang Li PhD student Department of Computer Science Yale University -- Yuliang Li PhD student Department of Computer Science Yale University ___ vpp-dev mailing list vpp-dev@lists.fd.io https://lists.fd.io/mailman/listinfo/vpp-dev
Re: [vpp-dev] stop handoff in SNAT
I think I get the reason. If the flow space split is dynamic, each thread has to propagate the state across all threads when new flows come, which requires locking. Using static flow space split can avoid this, at the cost of handoff for both directions. On Thu, Jul 20, 2017 at 9:44 AM, Yuliang Li wrote: > Thanks. That's a good point. But can I just use handoff on out2in? Because > the in2out traffic is already split by RSS. > > On Wed, Jul 19, 2017 at 10:15 PM, Matus Fabian -X (matfabia - PANTHEON > TECHNOLOGIES at Cisco) wrote: > >> Hi, >> >> >> >> You need handoff when running multithread because traffic for specific >> inside network user must be processed always on same thread in both >> directions. >> >> >> >> Regards, >> >> Matus >> >> >> >> *From:* vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] *On >> Behalf Of *Yuliang Li >> *Sent:* Thursday, July 20, 2017 5:58 AM >> *To:* vpp-dev@lists.fd.io >> *Subject:* [vpp-dev] stop handoff in SNAT >> >> >> >> Hi, >> >> >> >> Is there a way to stop handoff (move packet from one thread to another) >> in SNAT? I already use RSS to split packets across threads at the input, so >> I do not need it to spread traffic across threads again. >> >> >> >> Thanks, >> -- >> >> Yuliang Li >> >> PhD student >> >> Department of Computer Science >> >> Yale University >> > > > > -- > Yuliang Li > PhD student > Department of Computer Science > Yale University > -- Yuliang Li PhD student Department of Computer Science Yale University ___ vpp-dev mailing list vpp-dev@lists.fd.io https://lists.fd.io/mailman/listinfo/vpp-dev
Re: [vpp-dev] stop handoff in SNAT
Thanks. That's a good point. But can I just use handoff on out2in? Because the in2out traffic is already split by RSS. On Wed, Jul 19, 2017 at 10:15 PM, Matus Fabian -X (matfabia - PANTHEON TECHNOLOGIES at Cisco) wrote: > Hi, > > > > You need handoff when running multithread because traffic for specific > inside network user must be processed always on same thread in both > directions. > > > > Regards, > > Matus > > > > *From:* vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] *On > Behalf Of *Yuliang Li > *Sent:* Thursday, July 20, 2017 5:58 AM > *To:* vpp-dev@lists.fd.io > *Subject:* [vpp-dev] stop handoff in SNAT > > > > Hi, > > > > Is there a way to stop handoff (move packet from one thread to another) in > SNAT? I already use RSS to split packets across threads at the input, so I > do not need it to spread traffic across threads again. > > > > Thanks, > -- > > Yuliang Li > > PhD student > > Department of Computer Science > > Yale University > -- Yuliang Li PhD student Department of Computer Science Yale University ___ vpp-dev mailing list vpp-dev@lists.fd.io https://lists.fd.io/mailman/listinfo/vpp-dev
Re: [vpp-dev] stop handoff in SNAT
Hi, You need handoff when running multithread because traffic for specific inside network user must be processed always on same thread in both directions. Regards, Matus From: vpp-dev-boun...@lists.fd.io [mailto:vpp-dev-boun...@lists.fd.io] On Behalf Of Yuliang Li Sent: Thursday, July 20, 2017 5:58 AM To: vpp-dev@lists.fd.io Subject: [vpp-dev] stop handoff in SNAT Hi, Is there a way to stop handoff (move packet from one thread to another) in SNAT? I already use RSS to split packets across threads at the input, so I do not need it to spread traffic across threads again. Thanks, -- Yuliang Li PhD student Department of Computer Science Yale University ___ vpp-dev mailing list vpp-dev@lists.fd.io https://lists.fd.io/mailman/listinfo/vpp-dev
[vpp-dev] stop handoff in SNAT
Hi, Is there a way to stop handoff (move packet from one thread to another) in SNAT? I already use RSS to split packets across threads at the input, so I do not need it to spread traffic across threads again. Thanks, -- Yuliang Li PhD student Department of Computer Science Yale University ___ vpp-dev mailing list vpp-dev@lists.fd.io https://lists.fd.io/mailman/listinfo/vpp-dev
